An error on one screen no longer leaves a blank page

If a BackOffice screen stops working because of an unexpected error, you no longer get a blank page. A "Something went wrong" card takes the screen's place and the menu stays, so you can carry on to another page. "Try again" reloads just that screen without repeating or undoing anything you already saved, and "Reload page" reloads the whole page. If the error comes from a BackOffice update that has just gone out, the card says so and offers a reload straight away.